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GeForce 8800 GTS (G80) 320MB vs GeForce GT 420

Intro

The GeForce 8800 GTS (G80) 320MB comes with a core clock frequency of 513 MHz and a GDDR3 memory frequency of 792 MHz. It also features a 320-bit memory bus, and makes use of a 90 nm design. It is made up of 96 SPUs, 48 Texture Address Units, and 20 ROPs.

Compare that to the GeForce GT 420, which features core clock speeds of 700 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR3 RAM. It features 48 SPUs as well as 8 TAUs and 4 ROPs.

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Memory Bandwidth

In theory, the GeForce 8800 GTS (G80) 320MB will be 120% quicker than the GeForce GT 420 in general, due to its greater bandwidth. (explain)

GeForce 8800 GTS (G80) 320MB

63360 MB/sec

GeForce GT 420

28800 MB/sec

Difference: 34560 (120%)

Texel Rate

The GeForce 8800 GTS (G80) 320MB is much (about 340%) faster with regards to AF than the GeForce GT 420. (explain)

GeForce 8800 GTS (G80) 320MB

24624 Mtexels/sec

GeForce GT 420

5600 Mtexels/sec

Difference: 19024 (340%)

Pixel Rate

The GeForce 8800 GTS (G80) 320MB should be a lot (about 266%) faster with regards to anti-aliasing than the GeForce GT 420, and also should be able to handle higher screen resolutions while still performing well. (explain)

GeForce 8800 GTS (G80) 320MB

10260 Mpixels/sec

GeForce GT 420

2800 Mpixels/sec

Difference: 7460 (266%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

GeForce 8800 GTS (G80) 320MB

GeForce GT 420

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x.
The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen.
The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

GeForce 8800 GTS (G80) 320MB

GeForce GT 420

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.